please help me check the error

Hi, I am just doing some homework after spring break so I forgot some important things about matlab saving sript.

This is my homework: Write a function called odd_rms that returns orms, the square root of the mean of the squares of the first n positive odd integers, where n is a positive integer and the only input argument.

So far, I have tried to do it and I am actually know how to write a code for this:

This is my try :

function orms=odd_rms(n)
A=sqrt(mean((1:2:2n-1).^2));
end

I save my script as odd_rms and try it on command window something like odd_rms(3) but it doesn't show any answer (Error: File: odd_rms.m Line: 2 Column: 19)

I have tried plugging random number to it specific code sqrt(mean((1:2:2n-1).^2)) and they return the right answer.

Can someone explain the error on my script?

Thanks you so much

Answer 1

[Birdman]

You forgot to put multiplication operator. Try this:

function A=odd_rms(n)
A=sqrt(mean((1:2:2*n-1).^2));
end

[David]

thanks you. That really help me

[David]

Hi, this morning i try it and it was succesful, in the afternoon I tried again and it say : (Function 'odd_rms' has already been declared within this scope.)

This is my function :

function orms=odd_rms(n)
A=sqrt(mean((1:2:2*n-1).^2))
end

and I try it like : odd_rms(5)

I save the file as odd_rms

[Walter Roberson]

You accidentally included some commands before the function declaration, leading you to accidentally have the situation of having a script named odd_rms.m that includes a function named odd_rms . When you have a script, you cannot include a function with the same name as the script.

[David]

awesome, thanks you. I get it

Answer 2

[Walter Roberson]

Your function has variable orms as output but you only assign to A.

[David]

function orms=odd_rms(n)
orms=sqrt(mean((1:2:2*n-1).^2))
end

Is that correct?